Compensation-pendulum



(No Model.)

A. T. WILLIAMS.

COMPENSATION PENDULUM.

No. 248,541. Patented 0 93191881.

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UNITED STATES pATENT F E.

ALLEN T. WILLIAMS, OF TAUNTON, MASSACHUSETTS.

COMPENSATION-PENDULU M.

SPECIFICATION forming part of Letters Patent No. 248,541, dated October18, 1881.

Application filed June 4, 1881.

To all whom it may concern Be it known that I, ALLEN T. WILLIAMs, ofTaunton, of the county of Bristol and State of Massachusetts, haveinvented a new and useful Improvement in (Jompensation-Pendulums forClocks; and I do hereby declare the same to be described in thefollowing specification and represented in the accompanying drawings, ofwhich- Figure 1 is a front elevation, and Fig. 2 a

, longitudinal section, of a pendulum of my improved kind. Fig. 3 isatop view without itsso-called stirrup-bow. Fig. 4 is an end view, Fig.5 a transverse section, and Fig. 6 a longitudinal section, of thestirrup and parts at the upper portion of the pendulum, the last threefigures being made on an enlarged scale. Fig. 7 is a top View of one ofthe weights, and Fig. 8 a transverse section of it and its adjustingnut.

The nature of my invention is duly set forth in the claims hereinafterpresented.

In constructing this com pensation-pendulum I employ three metallicrods, A B A, arranged parallel to each other and at suitable distancesapart, the middle rod being of brass and the two outer ones of iron orsteel. In other words, the middle rod is to be of a metal or materialwhich, under any increase of temperature, will expand somewhat more thaneither of the other rods, which are to be snpposedto be of one kind ofmetal or material. These rods extend down from a cross-head, O, themiddle rod, B, at its foot being stepped upon the inner or shorter armsof two levers, D D, jointed or fulcrumed to the outer rods, A A, attheir lower ends, as shown. The longer arms of such levers extenddiametrically through two cylindrical or other proper-shaped weights, EE, each of which is formed with a segmental recess, or, arranged in itas shown, such recess being to enable the weight to be moved inwardnearly to the middle rod. Each weight is to be adapted to its lever-arm,so as to be capalole of being moved thereon lengthwise of it. Ascrewmut, 1), arranged to screw upon the lever-arm and to extendtransversely through the weight, serves, with a screw, 0, formed on sucharm, to effect the adjustment ot'the weight either nearer to or fartherfrom the next adjacent rod A, as circumstances may require. The outer orsteel rods, A A, are or may be (No model.)

connected by a series of cross pieces or bars, d, fastened-to them andarranged as represented. The middle or brass rod, B, extends looselythrough the cross-pieces d, and has upon its upper end a screw, e, toscrew into and through the cross-head 0. Within the said cross-head, andconcentrically on the rod B, is a small spnr-gear,f, which is adapted tothe rod by a feather-connection, and engaged with two other like gears,gg, arranged within the crosshead in manner as shown, such gears g 9being screwed upon the outer rods, A A, upon which the cross head fitsloosely. The cross head laps on the top of each of the gears g. Byrevolving the middle rod, B, either way transversely of it, the gearswill be revolved simultaneously. Thus, by means of the gears and screw,the distance of the cross-head from the weights may be either increasedor diminished, the three rods in the meantime not varying their relativepositions.

The cross-head O rests in a stirrup, F, and upon knife-edge bearingsh,extending up from the foot 75 of such stirrup, such bearings being atthe middle of the said foot and arranged in it lengthwise of it, inorder for the cross-head to be able to vibrate transversely of it uponsuch knife-edge bearings. The how of-the stirrup is separate from thefoot i, from the opposite sides of which knife-edge bearings ll projectinto holes m in the legs of the bow. Springs a, covering such holes, arefixed to the outer sides of the said legs. These springs serve, underordinary circumstances, to maintain the bowin connection with theknife-edge bearings l l and to readily admit of its removal from orapplication to them when 00- casion may require.

9 From the above it will be seen thatthe pendulum is suspended by meanswhich will admit of it oscillating in directions at right angles to eachother, such being productive of advantage. On a rise of temperature ofthe atmosphere taking place the middle rod of the pendulum will beexpanded more than will the two other rods, in consequence of which thelevers D will be moved on their fulcra, so as to force the outer arms ofsuch levers and their weights upward in a manner to maintain the commoncenter of gravity of the weights at the desirable distance from thelower edges of the knife-edge bearings l l, in order for the periods ofvibrations of the pendulum to be kept uniform. 80,011 a diminution ofthe temperature taking place the middle rod will contract lengthwisefaster than the outer rods, in which case the weights will fall so as tomaintain their common center of gravity at its proper distance from thebearings l I.

Should the levers incline a little or stand at either a slightly acuteor obtuse angle to the middle rod, the screws and nuts on the outer armsof such levers will afford means of ad justing the weights either nearerto or farther from the rods, in order to vary the distance of center ofgravity of the weights from the points of suspension of the pendulum.Thus it will be seen that the nuts and screws of thelevers and weightsafford additional andvery fine means of regulation of the pendulum.

I would remark that what is termed the bow of the stirrup may be formedor constructed differently from What is represented, as it may consistsimply of two arms to pro ject down from a proper means of support.

Should it be desirable to change the position of the levers D D, thecross-head is cut out or open to admit of the gear being moved out ofengagement with the gears g 9, thereby enabling the middle rod to berevolved without moving the outer rods.

What I claim as my invention in the described pendulum is as follows:

1. The combination of the rods A B A, as

described, having screws at their upper parts, and provided with thelevers and weights, as set forth, with the cross-head and the gearsadapted to such rods, in manner substantially as described.

2. The combination of the stirrup F,having its bow and foot connected'byknife-edge bean ings l I, with the cross-head O, the rods A B A, andthe two levers D,adapted to such rods and provided with weights, allbeing substantially as set forth.

3. The combination of the stirrup F, provided at its foot with the twosets of knifeedge bearings h and 1, arranged as set forth, with thecross-head O, the rods A B A, and the two levers D, adapted to such rodsand provided with weights, all being substantially as specified.

4. The combination of the adjusting-nuts b and screws 0 with the weightsE, levers D, rods A B A, and their connecting cross-head 0, all beingadapted, arranged, and to operate substantially as set forth.

5. Each of the weights E, recessed as described,'in combination with thelevers D,the three rods A B A, and their cross-head C, arranged as setforth.

ALLEN T. \VILLIAMS.

